On Wed, 14 Mar 2012 14:51:06 -0800, Joseph Spenner <joseph85750(a)yahoo.com>
wrote:
I'm currently trying to run a nightly backup/copy
of my production media
wiki to a "read only" copy on another system. I wrote a script to do
everything through ssh:
----
#!/usr/bin/ksh
scripts=/scripts
mysqldump --opt wikidb -u root -psomePass > $scripts/wikidb.sql
scp $scripts/wikidb.sql 10.4.3.1:tmp || exit
sleep 3
ssh 10.4.3.1 '/usr/bin/mysql -u root -psomePass wikidb < tmp/wikidb.sql'
|| exit
echo replica wiki database updated
echo syncing attachments and files
rsync --delete -avz -e ssh /var/www/htdocs/wiki/images
root@10.4.3.1:/var/www/htdocs/wiki
----
My copy/replica has an entry in the LocalSettings.php to make it a
read-only wiki:
$wgReadOnly = 'Read Only';
It works great.
However, when I access the replica after a period of time, it's VERY
slow/sluggish. If I edit the LocalSettings.php file and disable the
'read only' line, it's lightning fast again. If I then change it back
to 'read only', it's still fast but slows down over the course of the
night.
The only way around this was to make a little script which places a
normal edit-able LocalSettings.php file into place, then does a wget to
one of the wiki pages, then copies the 'read only' version of the
LocalSettings.php file back into place. After I run the script, it's
fast again.
Anyone know why this slowness occurs? I've tested the mysql response
time via command line while the wiki is slow, and the mysql is still
fast. It's some interaction between apache and mysql which causes this
replica to slow down. If I try to access a 'non wiki' document (ie:
some file on the webserver) it does not have any latency.
Any ideas/help would be great.
Thanks!
If you turn off read only but set $wgMainCacheType = CACHE_NONE; does your
wiki feel as slow as it does overnight?
--
~Daniel Friesen (Dantman, Nadir-Seen-Fire) [
http://daniel.friesen.name]